2 Chronicles 32:3-5

3 he took counsel with his princes and his mighty men to stop the waters of the springs which were outside of the city; and they helped him.

4 So many people gathered together, and they stopped all the springs, and the brook that flowed through the midst of the land, saying, “Why should the kings of Assyria come, and find much water?”

5 He took courage, and built up all the wall that was broken down, and raised it up to the towers, and the other wall outside, and strengthened Millo in the city of David, and made weapons and shields in abundance.